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JavaScript 操作 DOM 和 BOM 的原理</a></li><li class="sidebar-sub-header level2"><a href="/pages/5e6b02/#_3-javascript-的运行环境" class="sidebar-link">3.JavaScript 的运行环境</a></li><li class="sidebar-sub-header level2"><a href="/pages/5e6b02/#_4-node-js" class="sidebar-link">4.Node.js</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level3"><a href="/pages/5e6b02/#_4-1-什么是-node-js" class="sidebar-link">4.1 什么是 node.js</a></li><li class="sidebar-sub-header level3"><a href="/pages/5e6b02/#_4-2-node-js-运行环境" class="sidebar-link">4.2 node.js 运行环境</a></li><li class="sidebar-sub-header level3"><a href="/pages/5e6b02/#_4-3-node-js-的开发" class="sidebar-link">4.3 node.js 的开发</a></li><li class="sidebar-sub-header level3"><a href="/pages/5e6b02/#_4-4-node-js-的学习" class="sidebar-link">4.4 node.js 的学习</a></li></ul></li><li class="sidebar-sub-header level2"><a href="/pages/5e6b02/#_5-node-js-环境下运行-js-代码" class="sidebar-link">5.Node.js 环境下运行 js 代码</a><ul class="sidebar-sub-headers"><li 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class="sidebar-sub-header level3"><a href="/pages/5e6b02/#_6-3-判读读取是否成功" class="sidebar-link">6.3 判读读取是否成功</a></li><li class="sidebar-sub-header level4"><a href="/pages/5e6b02/#示例-2" class="sidebar-link">示例</a></li><li class="sidebar-sub-header level3"><a href="/pages/5e6b02/#_6-4-writefile-写入文件" class="sidebar-link">6.4 writeFile()写入文件</a></li><li class="sidebar-sub-header level4"><a href="/pages/5e6b02/#示例-3" class="sidebar-link">示例</a></li><li class="sidebar-sub-header level3"><a href="/pages/5e6b02/#_6-5-成绩整理案例" class="sidebar-link">6.5 成绩整理案例</a></li><li class="sidebar-sub-header level3"><a href="/pages/5e6b02/#_6-6-路径动态拼接的问题" class="sidebar-link">6.6 路径动态拼接的问题</a></li><li class="sidebar-sub-header level4"><a href="/pages/5e6b02/#示例-4" class="sidebar-link">示例</a></li><li class="sidebar-sub-header level4"><a href="/pages/5e6b02/#解决方案-1" class="sidebar-link">解决方案 1</a></li><li class="sidebar-sub-header level4"><a href="/pages/5e6b02/#解决方案-2-推荐" class="sidebar-link">解决方案 2（推荐）</a></li></ul></li><li class="sidebar-sub-header level2"><a href="/pages/5e6b02/#_7-path-模块" class="sidebar-link">7. path 模块</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level3"><a href="/pages/5e6b02/#_7-1-path-模块的使用" class="sidebar-link">7.1 path 模块的使用</a></li><li class="sidebar-sub-header level3"><a href="/pages/5e6b02/#_7-2-path-join-方法-推荐使用" class="sidebar-link">7.2 path.join()方法（推荐使用）</a></li><li class="sidebar-sub-header level3"><a href="/pages/5e6b02/#示例-5" class="sidebar-link">示例</a></li><li class="sidebar-sub-header level4"><a href="/pages/5e6b02/#注意点" class="sidebar-link">注意点</a></li><li class="sidebar-sub-header level3"><a href="/pages/5e6b02/#_7-3-path-basename-方法" class="sidebar-link">7.3 path.basename()方法</a></li><li class="sidebar-sub-header level4"><a href="/pages/5e6b02/#示例-6" class="sidebar-link">示例</a></li><li class="sidebar-sub-header level3"><a href="/pages/5e6b02/#_7-4-path-extname-方法" class="sidebar-link">7.4 path.extname()方法</a></li><li 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href="#node-js-学习第一天" class="header-anchor">#</a> Node.js 学习第一天</h1> <p>@[toc]</p> <h2 id="_1-javascript-在浏览器中被执行的原理"><a href="#_1-javascript-在浏览器中被执行的原理" class="header-anchor">#</a> 1.javascript 在浏览器中被执行的原理</h2> <ul><li>通过浏览器的<strong>JavaScript 引擎来实现 JavaScript 代码的解析</strong></li></ul> <h2 id="_2-javascript-操作-dom-和-bom-的原理"><a href="#_2-javascript-操作-dom-和-bom-的原理" class="header-anchor">#</a> 2. JavaScript 操作 DOM 和 BOM 的原理</h2> <ul><li><strong>浏览器中内置了 DOM 和 BOM 这样的 API 函数</strong></li> <li>JavaScript<strong>函数调用这些函数来实现 DOM 和 BOM 的操作</strong></li></ul> <h2 id="_3-javascript-的运行环境"><a href="#_3-javascript-的运行环境" class="header-anchor">#</a> 3.JavaScript 的运行环境</h2> <ul><li>代码正常运行所需的必要条件</li></ul> <p><img src="https://img-blog.csdnimg.cn/567c96b0bd094ed5b13532705b49555c.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5YeM5q2G,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="在这里插入图片描述"></p> <h2 id="_4-node-js"><a href="#_4-node-js" class="header-anchor">#</a> 4.Node.js</h2> <h3 id="_4-1-什么是-node-js"><a href="#_4-1-什么是-node-js" class="header-anchor">#</a> 4.1 什么是 node.js</h3> <ul><li><strong>==node.js 是==<strong>基于 chorm 浏览器 v8 引擎的</strong>==JavaScript 运行环境==</strong></li></ul> <h3 id="_4-2-node-js-运行环境"><a href="#_4-2-node-js-运行环境" class="header-anchor">#</a> 4.2 node.js 运行环境</h3> <ul><li><p><strong>浏览器是 JavaScript 的前端运行环境</strong></p></li> <li><p><strong>node.js 是 JavaScript 的后端运行环境</strong></p></li> <li><p>各自封装的 API 函数不同，JavaScript 调用也就不同，<strong>在 node.js 中无法进行 DOM,BOM,ajax 的操作</strong></p></li> <li><p>图解</p></li></ul> <p><img src="https://img-blog.csdnimg.cn/8de15a84dc544ac4af4173f6761ba803.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5YeM5q2G,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="在这里插入图片描述"></p> <h3 id="_4-3-node-js-的开发"><a href="#_4-3-node-js-的开发" class="header-anchor">#</a> 4.3 node.js 的开发</h3> <ul><li><p>基于 Express 框架(&lt;<a href="https://www.expressjs.com.cn/" target="_blank" rel="noopener noreferrer">Express - 基于 Node.js 平台的 web 应用开发框架 - Express 中文文档 | Express 中文网 (expressjs.com.cn)<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a>&gt;)</p></li> <li><p>基于 Electron 框架(&lt;<a href="https://www.electronjs.org/" target="_blank" rel="noopener noreferrer">Electron | 使用 JavaScript，HTML 和 CSS 构建跨平台的桌面应用程序。 (electronjs.org)<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a>&gt;)</p></li> <li><p>基于 restify 框架(&lt;<a href="http://restify.com/" target="_blank" rel="noopener noreferrer">Restify<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a>&gt;)</p></li></ul> <h3 id="_4-4-node-js-的学习"><a href="#_4-4-node-js-的学习" class="header-anchor">#</a> 4.4 node.js 的学习</h3> <ul><li>js 基础语法</li> <li>Node.js 内置 API 模块(fs,path,http)</li> <li>第三方模块（express mysql）</li></ul> <h2 id="_5-node-js-环境下运行-js-代码"><a href="#_5-node-js-环境下运行-js-代码" class="header-anchor">#</a> 5.Node.js 环境下运行 js 代码</h2> <ul><li>在终端（cmd）中输入如下命令</li></ul> <div class="language-txt line-numbers-mode"><pre class="language-txt"><code>node js文件路径
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>js 文件</li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code>console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'hello world'</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/de4c83185cb043188dcd3278968c9b0b.png#pic_center" alt="在这里插入图片描述"></p> <h3 id="_5-1-在当前目录打开-powershell"><a href="#_5-1-在当前目录打开-powershell" class="header-anchor">#</a> 5.1 在当前目录打开 powershell</h3> <ul><li><p><strong>快捷键：shift+鼠标右键</strong></p></li> <li><p>自动定位到当前目录</p></li> <li><p>然后输入命令 start cmd 可打开黑窗口</p></li></ul> <h3 id="_5-2-在-powershell-中执行-js-代码"><a href="#_5-2-在-powershell-中执行-js-代码" class="header-anchor">#</a> 5.2 在 powershell 中执行 js 代码</h3> <div class="language-js line-numbers-mode"><pre class="language-js"><code>node <span class="token string">&quot;当前要执行的js文件路径&quot;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="_5-3-一些命令行的快捷键"><a href="#_5-3-一些命令行的快捷键" class="header-anchor">#</a> 5.3 一些命令行的快捷键</h3> <table><thead><tr><th>快捷键</th> <th></th></tr></thead> <tbody><tr><td>↑ 方向键</td> <td>快速定位到上一次执行的命令</td></tr> <tr><td>tab 键</td> <td>能够快速补全路径</td></tr> <tr><td>esc 键</td> <td>能够快速清空当前已输入的命令</td></tr> <tr><td>cls 命令</td> <td>可以清空终端</td></tr></tbody></table> <h2 id="_6-fs-文件系统模块"><a href="#_6-fs-文件系统模块" class="header-anchor">#</a> 6.fs 文件系统模块</h2> <ul><li>用来操作文件的模块，提供了一系列的方法和属性</li></ul> <h3 id="_6-1-在-javascript-代码中-使用-fs-模块-需要先导入模块"><a href="#_6-1-在-javascript-代码中-使用-fs-模块-需要先导入模块" class="header-anchor">#</a> 6.1 在 JavaScript 代码中，使用 fs 模块，需要先导入模块</h3> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="_6-2-使用-fs-的-readfile-方法读取文件"><a href="#_6-2-使用-fs-的-readfile-方法读取文件" class="header-anchor">#</a> 6.2 使用 fs 的 readFile()方法读取文件</h3> <div class="language-js line-numbers-mode"><pre class="language-js"><code>fs<span class="token punctuation">.</span><span class="token function">readFile</span><span class="token punctuation">(</span>path<span class="token punctuation">[</span><span class="token punctuation">,</span>options<span class="token punctuation">]</span><span class="token punctuation">,</span>callback<span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><table><thead><tr><th>参数名</th> <th>说明</th></tr></thead> <tbody><tr><td>path</td> <td>要读取的文件路径，必选</td></tr> <tr><td>options</td> <td>编码格式，可选</td></tr> <tr><td>callback</td> <td>回调函数，必选</td></tr></tbody></table> <ul><li><strong>回调函数 callback 中有两个参数 err 和 datastr</strong></li> <li><strong>err 代表读取失败的结果</strong></li> <li><strong>datastr 代表读取成功的结果</strong></li></ul> <h4 id="示例"><a href="#示例" class="header-anchor">#</a> 示例</h4> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token comment">// 导入fs文件系统模块</span>
<span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">)</span>

<span class="token comment">// 读取文件</span>

fs<span class="token punctuation">.</span><span class="token function">readFile</span><span class="token punctuation">(</span><span class="token string">'./files/1.txt'</span><span class="token punctuation">,</span> <span class="token string">'utf8'</span><span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> datastr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token comment">// 失败的结果</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
  <span class="token comment">// 成功的结果</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>datastr<span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><ul><li>成功效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/0824d7b2ccc9454b82930d7ae81b972c.png#pic_center" alt="在这里插入图片描述"></p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token comment">// 导入fs文件系统模块</span>
<span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">)</span>

<span class="token comment">// 读取文件</span>

fs<span class="token punctuation">.</span><span class="token function">readFile</span><span class="token punctuation">(</span><span class="token string">'./files/11.txt'</span><span class="token punctuation">,</span> <span class="token string">'utf8'</span><span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> datastr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token comment">// 失败的结果</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
  <span class="token comment">// 成功的结果</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>datastr<span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><ul><li>失败效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/1d28b7cfc9af462c8ea6719dec448bdd.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5YeM5q2G,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="在这里插入图片描述"></p> <h3 id="_6-3-判读读取是否成功"><a href="#_6-3-判读读取是否成功" class="header-anchor">#</a> 6.3 判读读取是否成功</h3> <ul><li><strong>读取成功：err 对象的值为 null</strong></li> <li><strong>读取失败：err 对象的值为错误对象</strong></li></ul> <h4 id="示例-2"><a href="#示例-2" class="header-anchor">#</a> 示例</h4> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">)</span>

<span class="token comment">// 读取文件</span>

fs<span class="token punctuation">.</span><span class="token function">readFile</span><span class="token punctuation">(</span><span class="token string">'./files/1.txt'</span><span class="token punctuation">,</span> <span class="token string">'utf8'</span><span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> datastr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>err <span class="token operator">===</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'文件读取成功'</span> <span class="token operator">+</span> datastr<span class="token punctuation">)</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'文件读取失败'</span> <span class="token operator">+</span> err<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/13e40f2d361247b2bc11c8516c21014b.png#pic_center" alt="在这里插入图片描述"></p> <h3 id="_6-4-writefile-写入文件"><a href="#_6-4-writefile-写入文件" class="header-anchor">#</a> 6.4 writeFile()写入文件</h3> <ul><li>先指定的文件中写入内容</li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code>fs<span class="token punctuation">.</span><span class="token function">writeFile</span><span class="token punctuation">(</span>file<span class="token punctuation">,</span>data<span class="token punctuation">[</span><span class="token punctuation">,</span>options<span class="token punctuation">]</span><span class="token punctuation">,</span>callback<span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>参数说明</li></ul> <table><thead><tr><th>参数</th> <th>说明</th></tr></thead> <tbody><tr><td>file</td> <td>要写入的文件路径，必选</td></tr> <tr><td>data</td> <td>要写入的文件内容，必选</td></tr> <tr><td>options</td> <td>以何种方式写入文件，可选，默认 utf8</td></tr> <tr><td>callback</td> <td>回调函数，必选</td></tr></tbody></table> <h4 id="示例-3"><a href="#示例-3" class="header-anchor">#</a> 示例</h4> <div class="language-js line-numbers-mode"><pre class="language-js"><code>console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'helo word'</span><span class="token punctuation">)</span>

<span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">)</span>
<span class="token comment">// 写入文件</span>
fs<span class="token punctuation">.</span><span class="token function">writeFile</span><span class="token punctuation">(</span><span class="token string">'./files/2.txt'</span><span class="token punctuation">,</span> <span class="token string">'666'</span><span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">err</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'写入文件失败'</span> <span class="token operator">+</span> err<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'写入文件成功'</span> <span class="token operator">+</span> err<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/4fbe239111fd4969a92a97ae35907f40.png#pic_center" alt="在这里插入图片描述"></p> <p><img src="https://img-blog.csdnimg.cn/f1b9e15bf211498db05126f70903117c.png#pic_center" alt="在这里插入图片描述"></p> <h3 id="_6-5-成绩整理案例"><a href="#_6-5-成绩整理案例" class="header-anchor">#</a> 6.5 成绩整理案例</h3> <ul><li>成绩.txt 的内容</li></ul> <p><img src="https://img-blog.csdnimg.cn/e0e47cf101534eabbab592374fdd8a2d.png#pic_center" alt="在这里插入图片描述"></p> <ul><li>整理后的内容</li></ul> <p><img src="https://img-blog.csdnimg.cn/92a3de6b5fe14b71a401ea139ae53d53.png#pic_center" alt="在这里插入图片描述"></p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">)</span>

fs<span class="token punctuation">.</span><span class="token function">readFile</span><span class="token punctuation">(</span><span class="token string">'./files/成绩.txt'</span><span class="token punctuation">,</span> <span class="token string">'utf8'</span><span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> datastr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'成绩信息读取失败'</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'成绩读取成功'</span><span class="token punctuation">)</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'开始写文件到成绩-ok------'</span><span class="token punctuation">)</span>

    <span class="token comment">// 将=号替换成：号</span>
    <span class="token keyword">while</span> <span class="token punctuation">(</span>datastr<span class="token punctuation">.</span><span class="token function">indexOf</span><span class="token punctuation">(</span><span class="token string">'='</span><span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      datastr <span class="token operator">=</span> datastr<span class="token punctuation">.</span><span class="token function">replace</span><span class="token punctuation">(</span><span class="token string">'='</span><span class="token punctuation">,</span> <span class="token string">':'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>datastr<span class="token punctuation">)</span>

    <span class="token comment">// 使用空格分隔字符串，得到字符数组</span>
    <span class="token keyword">var</span> dataarr <span class="token operator">=</span> datastr<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span>

    <span class="token keyword">var</span> newStr <span class="token operator">=</span> dataarr<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">'\r\n'</span><span class="token punctuation">)</span>

    <span class="token comment">// 整理后的内容写入成绩-ok.txt中</span>
    fs<span class="token punctuation">.</span><span class="token function">writeFile</span><span class="token punctuation">(</span><span class="token string">'./files/成绩-ok.txt'</span><span class="token punctuation">,</span> newStr<span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">err</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'行数据写入失败'</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'数据写入成功'</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br></div></div><h3 id="_6-6-路径动态拼接的问题"><a href="#_6-6-路径动态拼接的问题" class="header-anchor">#</a> 6.6 路径动态拼接的问题</h3> <ul><li>使用 fs 模块读取文件时，如果<strong>提供的是以./ 或 ../开头的相对路径时，容易出现路径动态拼接错误</strong></li> <li>原因：代码在运行时，<strong>会以执行 node 命令时所处的目录，动态拼接出文件的完整路径</strong></li></ul> <h4 id="示例-4"><a href="#示例-4" class="header-anchor">#</a> 示例</h4> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">)</span>

fs<span class="token punctuation">.</span><span class="token function">readFile</span><span class="token punctuation">(</span><span class="token string">'./files/1.txt'</span><span class="token punctuation">,</span> <span class="token string">'utf8'</span><span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> datastr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'文件读取失败'</span> <span class="token operator">+</span> err<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'文件读取成功'</span> <span class="token operator">+</span> datastr<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/ed5c9d91fd9d4a859298604c4a8fa4a6.png#pic_center" alt="在这里插入图片描述"></p> <h4 id="解决方案-1"><a href="#解决方案-1" class="header-anchor">#</a> 解决方案 1</h4> <ul><li>使用文件的绝对路径</li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">)</span>

fs<span class="token punctuation">.</span><span class="token function">readFile</span><span class="token punctuation">(</span>
  <span class="token string">'E:\\node.js代码\\day01\\files\\1.txt'</span><span class="token punctuation">,</span>
  <span class="token string">'utf8'</span><span class="token punctuation">,</span>
  <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> datastr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">return</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'文件读取失败'</span> <span class="token operator">+</span> err<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
      console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'文件读取成功'</span> <span class="token operator">+</span> datastr<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/37a4f5cf325e47f88d34dc08e2548625.png#pic_center" alt="在这里插入图片描述"></p> <h4 id="解决方案-2-推荐"><a href="#解决方案-2-推荐" class="header-anchor">#</a> 解决方案 2（推荐）</h4> <ul><li><strong>==使用__dirname:代表当前文件所处的目录==</strong></li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">)</span>

fs<span class="token punctuation">.</span><span class="token function">readFile</span><span class="token punctuation">(</span>__dirname <span class="token operator">+</span> <span class="token string">'/files/1.txt'</span><span class="token punctuation">,</span> <span class="token string">'utf8'</span><span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> datastr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'文件读取失败'</span> <span class="token operator">+</span> err<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'文件读取成功'</span> <span class="token operator">+</span> datastr<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/f849560ec44c422281169bb6f24dac1c.png#pic_center" alt="在这里插入图片描述"></p> <h2 id="_7-path-模块"><a href="#_7-path-模块" class="header-anchor">#</a> 7. path 模块</h2> <ul><li>概念：用来处理路径的模块，提供了一系列的属性和方法</li></ul> <h3 id="_7-1-path-模块的使用"><a href="#_7-1-path-模块的使用" class="header-anchor">#</a> 7.1 path 模块的使用</h3> <ul><li>使用前需要导入模块</li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">const</span> path <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'path'</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="_7-2-path-join-方法-推荐使用"><a href="#_7-2-path-join-方法-推荐使用" class="header-anchor">#</a> 7.2 path.join()方法（推荐使用）</h3> <ul><li><p><strong>将多个字符串拼接成一个完整的路径字符串</strong></p></li> <li><p>语法</p></li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code>path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token operator">...</span>paths<span class="token punctuation">]</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>参数说明</li></ul> <table><thead><tr><th>参数</th> <th>说明</th></tr></thead> <tbody><tr><td>...path</td> <td>路径片段的序列</td></tr> <tr><td>返回值</td> <td>string 类型，路径字符串</td></tr></tbody></table> <h3 id="示例-5"><a href="#示例-5" class="header-anchor">#</a> 示例</h3> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">const</span> path <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'path'</span><span class="token punctuation">)</span>

<span class="token keyword">var</span> str <span class="token operator">=</span> path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">'a/b/v'</span><span class="token punctuation">,</span> <span class="token string">'../'</span><span class="token punctuation">,</span> <span class="token string">'/m/n'</span><span class="token punctuation">,</span> <span class="token string">'c'</span><span class="token punctuation">)</span>

console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>str<span class="token punctuation">)</span>

<span class="token keyword">var</span> str2 <span class="token operator">=</span> path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'./files/1.txt'</span><span class="token punctuation">)</span>

console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>str2<span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/1b9068094e1242ed815fec82a9a18eb3.png#pic_center" alt="在这里插入图片描述"></p> <h4 id="注意点"><a href="#注意点" class="header-anchor">#</a> 注意点</h4> <ul><li><p><strong><code>../</code>路径拼接后会抵消一层目录</strong></p></li> <li><p><strong>以后凡涉及路径拼接的操作，都推荐使用 path.join()方法处理，不推荐使用+号拼接字符串</strong></p></li></ul> <h3 id="_7-3-path-basename-方法"><a href="#_7-3-path-basename-方法" class="header-anchor">#</a> 7.3 path.basename()方法</h3> <ul><li><p><strong>获取文件路径的最后一个部分，即文件名的部分</strong></p></li> <li><p>语法</p></li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code>path<span class="token punctuation">.</span><span class="token function">basename</span><span class="token punctuation">(</span>path<span class="token punctuation">[</span><span class="token punctuation">,</span>ext<span class="token punctuation">]</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>参数说明</li></ul> <table><thead><tr><th>参数</th> <th>说明</th></tr></thead> <tbody><tr><td>path</td> <td>一个路径名的字符串</td></tr> <tr><td>ext</td> <td>可选参数，表示文件扩展名</td></tr> <tr><td>返回值</td> <td>string 类型，文件路径的最后一个部分</td></tr></tbody></table> <h4 id="示例-6"><a href="#示例-6" class="header-anchor">#</a> 示例</h4> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">const</span> path <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'path'</span><span class="token punctuation">)</span>

<span class="token keyword">var</span> pathstr <span class="token operator">=</span> <span class="token string">'a/b/c/index.html'</span>

<span class="token comment">// 获取路径的最后一个部分</span>

<span class="token keyword">var</span> strName <span class="token operator">=</span> path<span class="token punctuation">.</span><span class="token function">basename</span><span class="token punctuation">(</span>pathstr<span class="token punctuation">)</span>

console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>strName<span class="token punctuation">)</span>

<span class="token comment">// 添加文件扩展名参数，则返回值中不包含文件扩展名</span>

<span class="token keyword">var</span> strName2 <span class="token operator">=</span> path<span class="token punctuation">.</span><span class="token function">basename</span><span class="token punctuation">(</span>pathstr<span class="token punctuation">,</span> <span class="token string">'.html'</span><span class="token punctuation">)</span>

console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>strName2<span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/fc6cde87aa3a4c83902a4f5ddb4c7703.png#pic_center" alt="在这里插入图片描述"></p> <h3 id="_7-4-path-extname-方法"><a href="#_7-4-path-extname-方法" class="header-anchor">#</a> 7.4 path.extname()方法</h3> <ul><li><p><strong>获取一个路径名中的扩展名的部分</strong></p></li> <li><p>语法</p></li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code>path<span class="token punctuation">.</span><span class="token function">extname</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>参数说明</li></ul> <table><thead><tr><th>参数</th> <th>说明</th></tr></thead> <tbody><tr><td>path</td> <td>路径的字符串</td></tr> <tr><td>返回值</td> <td>扩展名字符串</td></tr></tbody></table> <h4 id="示例-7"><a href="#示例-7" class="header-anchor">#</a> 示例</h4> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">const</span> path <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'path'</span><span class="token punctuation">)</span>

<span class="token comment">// 定义一个文件存放路径</span>

<span class="token keyword">var</span> fpath <span class="token operator">=</span> <span class="token string">'a/b/c/index.html'</span>

<span class="token comment">// 获取文件路径中的扩展名</span>

<span class="token keyword">var</span> extName <span class="token operator">=</span> path<span class="token punctuation">.</span><span class="token function">extname</span><span class="token punctuation">(</span>fpath<span class="token punctuation">)</span>

console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>extName<span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/0f1b66420b934fda9e483c367aed1d4b.png#pic_center" alt="在这里插入图片描述"></p> <h2 id="_8-一个时钟案例-拆分-html-文件中的-style-标签的内容和-script-标签内的内容"><a href="#_8-一个时钟案例-拆分-html-文件中的-style-标签的内容和-script-标签内的内容" class="header-anchor">#</a> 8.一个时钟案例（拆分 HTML 文件中的 style 标签的内容和 script 标签内的内容）</h2> <h3 id="思路"><a href="#思路" class="header-anchor">#</a> 思路</h3> <p><img src="https://img-blog.csdnimg.cn/f0fa49ab12334cca9ebaf42210ffcfd2.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5YeM5q2G,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="在这里插入图片描述"></p> <ul><li>代码实现</li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token comment">// 导入fs模块</span>
<span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">)</span>
<span class="token comment">// 导入path模块</span>
<span class="token keyword">const</span> path <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'path'</span><span class="token punctuation">)</span>

<span class="token comment">// 定义一个匹配style标签的正则表达式</span>
<span class="token comment">//  \s 代表任意空白字符，\S代表任意非空白字符，*代表匹配多次，结束标签中的&lt;\/style&gt; 的\用于转义，防止不合法</span>
<span class="token keyword">var</span> regStyle <span class="token operator">=</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">&lt;style&gt;[\s\S]*&lt;\/style&gt;</span><span class="token regex-delimiter">/</span></span>

<span class="token comment">// 定义一个匹配script标签内容的正则表达式</span>
<span class="token keyword">var</span> regScript <span class="token operator">=</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">&lt;script&gt;[\s\S]*&lt;\/script&gt;</span><span class="token regex-delimiter">/</span></span>

<span class="token comment">// 获取files下index.html文件的字符串内容</span>

<span class="token keyword">var</span> htmlPath <span class="token operator">=</span> path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'./index.html'</span><span class="token punctuation">)</span>

fs<span class="token punctuation">.</span><span class="token function">readFile</span><span class="token punctuation">(</span>htmlPath<span class="token punctuation">,</span> <span class="token string">'utf8'</span><span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> datastr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'读取文件失败'</span> <span class="token operator">+</span> err<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'读取文件成功'</span><span class="token punctuation">)</span>

    <span class="token comment">// 存放文件字符串</span>

    <span class="token keyword">var</span> htmlStr <span class="token operator">=</span> datastr
    <span class="token function">resloveCss</span><span class="token punctuation">(</span>htmlStr<span class="token punctuation">)</span>
    <span class="token function">resloveJs</span><span class="token punctuation">(</span>htmlStr<span class="token punctuation">)</span>
    <span class="token function">resloveHtml</span><span class="token punctuation">(</span>htmlStr<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token comment">// 将内嵌的style标签的内容写入css文件</span>
<span class="token keyword">function</span> <span class="token function">resloveCss</span><span class="token punctuation">(</span><span class="token parameter">htmlStr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token comment">// 匹配正则表达式</span>

  <span class="token keyword">var</span> styleStr <span class="token operator">=</span> regStyle<span class="token punctuation">.</span><span class="token function">exec</span><span class="token punctuation">(</span>htmlStr<span class="token punctuation">)</span>

  <span class="token comment">// 将标签名去除</span>
  <span class="token comment">// console.log(styleStr);</span>

  <span class="token keyword">var</span> cssStr <span class="token operator">=</span> styleStr<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">replace</span><span class="token punctuation">(</span><span class="token string">'&lt;style&gt;'</span><span class="token punctuation">,</span> <span class="token string">''</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">replace</span><span class="token punctuation">(</span><span class="token string">'&lt;/style&gt;'</span><span class="token punctuation">,</span> <span class="token string">''</span><span class="token punctuation">)</span>

  <span class="token keyword">var</span> cssPath <span class="token operator">=</span> path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'./files/index.css'</span><span class="token punctuation">)</span>
  fs<span class="token punctuation">.</span><span class="token function">writeFile</span><span class="token punctuation">(</span>cssPath<span class="token punctuation">,</span> cssStr<span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">err</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">return</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'写入文件失败'</span> <span class="token operator">+</span> err<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
      console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'写入index.css成功'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token comment">// 将内嵌script标签内的内容写入 js文件中</span>
<span class="token keyword">function</span> <span class="token function">resloveJs</span><span class="token punctuation">(</span><span class="token parameter">htmlStr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">var</span> scriptStr <span class="token operator">=</span> regScript<span class="token punctuation">.</span><span class="token function">exec</span><span class="token punctuation">(</span>htmlStr<span class="token punctuation">)</span>

  <span class="token keyword">var</span> jsStr <span class="token operator">=</span> scriptStr<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">replace</span><span class="token punctuation">(</span><span class="token string">'&lt;script&gt;'</span><span class="token punctuation">,</span> <span class="token string">''</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">replace</span><span class="token punctuation">(</span><span class="token string">'&lt;/script&gt;'</span><span class="token punctuation">,</span> <span class="token string">''</span><span class="token punctuation">)</span>

  <span class="token keyword">var</span> jsPath <span class="token operator">=</span> path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'./files/index.js'</span><span class="token punctuation">)</span>
  fs<span class="token punctuation">.</span><span class="token function">writeFile</span><span class="token punctuation">(</span>jsPath<span class="token punctuation">,</span> jsStr<span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">err</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">return</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'写入文件失败'</span> <span class="token operator">+</span> err<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
      console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'写入index.js成功'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token comment">// 将html文件中的内嵌式style 和 script 标签的内容替换为 外联式的引用</span>

<span class="token keyword">function</span> <span class="token function">resloveHtml</span><span class="token punctuation">(</span><span class="token parameter">htmlStr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">var</span> newHtml <span class="token operator">=</span> htmlStr
    <span class="token punctuation">.</span><span class="token function">replace</span><span class="token punctuation">(</span>regStyle<span class="token punctuation">,</span> <span class="token string">&quot;&lt;link rel='stylesheet' href='./index.css'/&gt;&quot;</span><span class="token punctuation">)</span>
    <span class="token punctuation">.</span><span class="token function">replace</span><span class="token punctuation">(</span>regScript<span class="token punctuation">,</span> <span class="token string">&quot;&lt;script src='./index.js'&gt;&lt;/script&gt;&quot;</span><span class="token punctuation">)</span>
  <span class="token keyword">var</span> newpath <span class="token operator">=</span> path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'./files/index.html'</span><span class="token punctuation">)</span>
  fs<span class="token punctuation">.</span><span class="token function">writeFile</span><span class="token punctuation">(</span>newpath<span class="token punctuation">,</span> newHtml<span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">err</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">return</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'html文件写入失败'</span> <span class="token operator">+</span> err<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
      console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'html文件写入成功'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br><span class="line-number">73</span><br><span class="line-number">74</span><br><span class="line-number">75</span><br><span class="line-number">76</span><br><span class="line-number">77</span><br><span class="line-number">78</span><br><span class="line-number">79</span><br><span class="line-number">80</span><br><span class="line-number">81</span><br><span class="line-number">82</span><br><span class="line-number">83</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/36f13c68e29d4e3b88fc4cd6eda0e39f.gif#pic_center" alt="在这里插入图片描述"></p> <h4 id="注意点-2"><a href="#注意点-2" class="header-anchor">#</a> 注意点</h4> <ul><li><strong>fs.writeFile()方法只能用来创建文件，不能用来创建目录（目录前提要存在才能在改目录下创建文件）</strong></li> <li><strong>重复调用 fs.writeFile()写入同一个文件，新写入的内容会覆盖之前的旧内容</strong></li></ul></div></div>  <div class="page-edit"><div class="edit-link"><a href="https://github.com/linxin1123/vuepress-blog/edit/master/docs/01.前端/47.NodeJs笔记/01.Node.js学习第一天.md" target="_blank" rel="noopener noreferrer">编辑</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <!----> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2023/02/17, 11:29:32</span></div></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><a href="/pages/70bca0/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">ajax学习第五天</div></a> <a href="/pages/9359f8/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">js学习第二天</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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